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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2fc1f8efece729cbcfaf862aeb02213b141b8705015a1f1c8e5765b44dbb43' 
  AND token = 'pUNhur5/vW7+Yb2+HJf2tJdmqReHUPGqcYBumT9T+9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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