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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f108a3329f512444ba09d2bc15d6d483ed5b95d1575264103ca13032b09f4a3' 
  AND token = 'BY5qbtiTlW4Lo4L2vXt9333RE8wrjVdgqZyDnBIYWqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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