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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061c0fa4d5798a3f60a72226783cee53c2beb77a5b9dcd7eedb83781d72314dd' 
  AND token = '460O4vIA6cBhDUjPGSyG+Zde8RD8trI9R3y+5Pe/X1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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