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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c194ef25f162c78a6d84d6547c4c12c45a36b3bb1c9902ee7f28aa17b59a1b' 
  AND token = 'sV51vJwIkbsPNdELvg8n68o5rBzgycWW6emsBhlFDro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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