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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5492ddf9cbd24c11e26da4168fd70c9700f3535b911a06fb8bd5957e397453f2' 
  AND token = 't6FrwhTqzLni+wIeVww9Tn/Hs7V587CFeeilOjXVsf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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