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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9391130c03c5e97d3df66d82a6fb72a6f68d8af4461eac091f80334660e6cf30' 
  AND token = 'nm2R2l75EQyNPsLxdW6enzw9BoDZA/UwV1IgJR1DNac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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