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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd3d94e8768d3d28d08a5b5484f67ffe0bf60b82e08d5838bf2e3bae00bb7a7' 
  AND token = 'smYW0skkyKdY9dyQxc/eulRwRsJrnSBSDfon33YJPok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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