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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1dd5691a2c4e74198c43ec84fe1e18b1d87b826330c38fe924d2d6989c6e506' 
  AND token = 'YnjhItZkONhBgALn6kPkk2X2gFdX9aL/PAl3halDX/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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