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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799f27cfd34c024397e55c29fd777072376df11cda1089bb6b6652f4314e3ee0' 
  AND token = 'ZFy8O5MFyhCEyUiTEH8Or4RLg1+YydWxfXILb/ckjZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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