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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba01638e2a0caf839af35b99b38ccb655a92d0c3b4a584d7b4456741fc2b62c' 
  AND token = '3ifuWMwiPmstF6rnNLq+cBcGhCCmewfdlYRq/06myc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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