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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c3c049a16e6fd92435f12c09002af7d6678a83e931008ebafe08f67897bba3' 
  AND token = 'ThnucBaA5p/3fX+JrahaimfP1OsqTlCehYrAT1hZFVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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