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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34f29d202d972821929ba06846157ed5717fcb4ffd9c29a162a412506572f17' 
  AND token = 'CcI5b7Pd4jnSy5tktBn/qmUadPxTm6oZuWiOBXca46g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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