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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3837a97632a681614dd8da19d8ec3b94ebc6b33c87db0b8405f0deb4e429a5c' 
  AND token = 'Ga3ioIUIF6jct8EjP5LGuuaC+WvzSpB0xaXsDRb37VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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