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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba29f605f61aae401046a729236c478f67bb27e43aea73f40aa0ac93d97461d' 
  AND token = 'Cx4kibtn/N5UXOMps6g0Y8w/HAMjeN/4bIFgBhtfT9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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