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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7dad1c7dc7bf9d70964399d036cbcc46a5a62eb621857ac38cf6215f6263f4' 
  AND token = 'sIyqJ9KDGfPMB3mAbAejhZ6Rh5WbEqAa+7Fy3pEN/1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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