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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50c791afa6540627eee7d4a9023be5ee33234a61956c18640338ae92a7f3e85' 
  AND token = '6gYvAt238Svxyrag6K1pdP3mvgBLfsmLDuMUJ2OwMtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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