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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd8596e127ff87053e17daf0db2281652e5b6255eb584307f19e7931386bbb6' 
  AND token = 'rZaLMD57epY3aayZ0YCXffs7tmzwqCWuke9MJ6tLNf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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