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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b17e3c0862e605d5d3dda4312296930ee8fbca9d86bbeedb29c08978fda6a3' 
  AND token = 'bqkKPOaOm9GDfjIfNm70Q9ScMa25O3rl3H0cqOf9Mc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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