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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db23731ee67586e07bafe2e7d7c5ec423daeb8d57462124a8c2242d1c414c81' 
  AND token = '7zjCfrTdbXZNUCh4e0hAl/ImG0siV9bISEZKQmuQDtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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