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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb7941b7a6498a8ed2d9bdf2a9162c1e5a9092e9acf21289608dbbe129457ac' 
  AND token = 'jMGgJlIiEYKGnm3kUgUsV4e/Ijgp6WBM9uH7BaOW8xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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