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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5888a6e76994c21585e433a9d6384eb16cbd6e67504cedd2ac509fa340dd873' 
  AND token = 'e+Hyyc6Q7I11RAamOUg7l+DrBN190NBNG+470tmW5QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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