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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3ca960858314aec6dc9d506ddaa2d3b43d8299cb192786dae9782bceaf044e' 
  AND token = '0ZULXFMXaaOpJ/RctNRQGvUBjuR4SVRo1BDO+bloyz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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