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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c52fcc16b0a6934cbef8a4075cdf272a63aa3005df7c322d7593351c68f1d31' 
  AND token = 'SGaGbW1Q2Lq+sWic7aMv32bGyiLGomvobNPyTtRawJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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