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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d51f65b1a4d9edcca5894feff886531d8e9316014b44aaac23839755edccfc' 
  AND token = 'ui5MMecYiPp5vTlA5Ap09Vc06HwgQCVX7+PoWo5b020=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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