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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52098be9645e66c49a4b1daf2170e55569815d9c50b9c445e143b8ec43d9f71e' 
  AND token = 'E7D5DsM6JnksH1jVv9TtSlsM7tmH5Q5HhorZQhKrSHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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