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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985a719c553ebaa25f4aecd99df2c9d50ab112a161d1288cd20fe9167113b3f9' 
  AND token = 'OQRmNeHapJ29juSXit7bkHH3ZApEb3pTiYIQF0okFhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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