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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4292e84e5a13f6a5636c754d76f6eed3d9ed062e8701ddff2d2b4fab70b7d10d' 
  AND token = 'vwFKzjuXB4foc1kVfoGyq2mNOrPYBOO2WPsCTEZyelY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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