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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d1da5f10f2594d0f7dc7e51d7df4ab9640ea7aa355f3dd9b1b8ae1de3c0c90' 
  AND token = 'IC3SbLBEnHF2m440ZlrJ5GwEWappSTUVc6JVYBteosI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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