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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3204f6d4662a31311355b97093fa72e2f413fe8b109fe44c3d30118ee3576ef5' 
  AND token = 'OiR2v0ewm5pcK2F1mBkxR4S7sLnm0N+RXIx9GerLIAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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