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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857df8b05ccdfb2e6f062b2a18a4f25af12cea4377808d9d877b85b6d118399d' 
  AND token = 'RzbL3AouHfrpX4+ChuRxEqSlIn1F/FCn9atYkrxj530=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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