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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5783560287460eff09898303a3c37bd5897718d423eadefaccac408e06cd6eb' 
  AND token = 'Ku12kieXXBhFQKNi19pKrIUF6q7XeX8GHiPCgEx2HWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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