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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50e09f2d5d87aa41e01539b8a9047b605103ba1227e5cf0740bfb098ba32e3a' 
  AND token = 'pfTCervnF9P6CqMUO8pVmHl5SGnkCufdD6WF/xQfzcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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