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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3b4acb4330324f852d253c2d92f02ceb8cbff166f1393f8f1330894cdde631' 
  AND token = 'scY0O4GwyICsKBKePKC5+bCm8aXEAbQ7/gnhqyu6RdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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