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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba4785e8d38fe38c95219f3f6a0463da2bdc5fb94dfa5f2836b201d7545ec26' 
  AND token = '2nlNmkOK5UnKR4+p0S+LjsrcepKl5UtUsY7o4nM3jSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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