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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8589944855b74d48bd8cd22b421ab53f22ad932dbee479fc0889b1d530278b19' 
  AND token = '7oqWmTWK/Bs7YIDrKqzedJJW7SpcI81z0g7613boVLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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