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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870b39b80667c2af591a5e47d731e793ce81ec9479d2c13b3d29c5064c96133c' 
  AND token = 'I0DoTOF9p0UhQ28jZNUQ2S5LC10bUMN1Zrgy3dNpsZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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