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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6124579cf924613a1757c3e99d7cbb535d0efa82eed39919dc9c6ac913ed12' 
  AND token = '5AZn3w2PHFY9BSL+5cX6kOZ7QOC9vMPyb2UuXa4f2FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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