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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac828e6ab33dbaf3f38566ae875ef6f67a8f94be30e6b7281b9a96ea9b5307a' 
  AND token = 'Xhjm77skyimYoRZ8yZvaAD38Qbh/nI+WtpkUCWwcBzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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