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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17cb6a858fede57f41369df65a79bdbb7f83df39394bc21c22a01cd6abb5a14' 
  AND token = 'nK5f07cmOR5lc0LBG/F4EppWIOzDzxUMMIO9J1vogQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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