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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7ab62da43a3bb5db02d17a314341c0743e4351e83b97a047947501f20eebe6' 
  AND token = '0IJZvNpt14FlwFy2ihsUPfxFUi1qP4PvDVvHQ5UePR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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