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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2753488532e748c15d8cdd5ca9a620e7b2ee1fcfe7a0d4bb3a345be50da1317d' 
  AND token = 'MO39nJZc3Zky/KT74TBesFsa4Mv6Y+MDGli6BCXo+CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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