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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e12ca0a4d6684db636a1c473086e96eeb435be4651dfff810703408df0e90c' 
  AND token = 'EQ6rZlX8AEB4QRxx/IiTVgsA/O4QzwmLJcOkd1oCIiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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