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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e559b357cba17620fd5c029cc214272b007171b15ee45442c7c0697da6bd99f0' 
  AND token = 'NBskqyOnIBxFTsQ3HDgyAbgi4NlAKjpdT0q6rwYlcpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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