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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71388b1f11f22e11054e872ed765aa28d50b29749656f48fc2ffdc64f97e7a25' 
  AND token = '8N3tuJ+uh28Rle56BR2sWWtraTG3psHw4jTEp+Q/ySM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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