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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29fec23f89c760fe0d2c8f707021af2436cc1ce89e2d02c09bbcbe7d07d9929' 
  AND token = 'qWworufeo94S8KB2ChFtm89QJmR6ZsZxau2WRoWFfd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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