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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1599ae2c9b0be4c95c9e66706a0d8a9967a870f0b439f7fb23fbe8e8d4cd19b4' 
  AND token = 'A7STmuBkHY9EzGxs7w+3B7tOq34Q274ABx3MS1spNnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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