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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18dda6191274308ea6b9ecb923fb817e136fbebf6f1f242cd4025a4d60ecb34' 
  AND token = 'RSGprGxKPEmikQqH1Xp88/UgRCg0tzJaa2UZHXxifzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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