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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5100dc856058bc50ad782a6700b18f01ae9eaaf92207e081675b150b98904ef3' 
  AND token = 'fP5ePuevGyurJxNpNI494bM6gogu0gBO02k/YcHAc2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}