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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7382dec503f260f458dc58a6a2636f5a47f7a98f35def4a14ddce8731a098fd2' 
  AND token = 'L1jZ7bZGVw0T5nVTksFQMo6De7Vhgf7LTLDKjn8ri1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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