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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873ba6123c7b4479c5ad0c066ff20a9314a7380e32998b18b6d075ea226eeeba' 
  AND token = 'WRn3GazbrBO/vc5UJ0HrWZMFNptBCZAOMiywvrZs4fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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