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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9b6849d94d5934bccd0bd5acaadcb269109b26370ff8ca59adcb3868d00934' 
  AND token = 'rG4MAA84U02dkNGn8Fk8EjUSx/l9BZdionb37naM+XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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