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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f400d279648e5bc2fc31aa500b880a42a74103e1a125c4d96211af4c5459f497' 
  AND token = 'uH6/OvvM/nwK0G0vgLb2stQ1VerbjiNACxL+d2n2iEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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