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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31f12c0552ae17fa8c0f0df5bcac194a8915e0470a05abad17e347254f1a5c5' 
  AND token = '7LV/VRNG/mlzkv0IRODgPZUdGNFXM6ZhU968XMePvpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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